Metal powder

Abstract

The present invention relates to a metal powder containing: 0.001 mass %≤C≤0.45 mass %, 0.01 mass %≤Si≤3.50 mass %, Mn≤2.0 mass %, 7.5 mass %≤Cr≤21.0 mass %, 1.5 mass %≤Ni≤7.0 mass %, Mo≤1.3 mass %, 0.05 mass %≤V≤2.0 mass %, Al≤0.015 mass %, and N≤0.20 mass %, with the balance being Fe and unavoidable impurities, satisfying 0.05 mass %≤C+N≤0.58 mass %, and satisfying: 10<15C+Mn+0.5Cr+Ni<20 and Cr eq /Ni eq <5.6, where Cr eq =Cr+Mo+1.5Si+0.5Nb, and Ni eq =Ni+30C+30N+0.5Mn.

What is claimed is: 
     
       1. A metal powder,
 comprising:
 0.22 mass %≤C≤0.45 mass %, 
 0.3 mass %≤Si≤3.50 mass %, 
 Mn≤2.0 mass %, 
 7.5 mass %≤Cr≤21.0 mass %, 
 1.5 mass %≤Ni≤7.0 mass %, 
 Mo≤1.3 mass %, 
 0.05 mass %≤V≤2.0 mass %, 
 Al≤0.015 mass %, and 
 N≤0.20 mass %, 
 with the balance being Fe and unavoidable impurities, 
 
 satisfying:
 0.05 mass %≤C+N≤0.58 mass %, and 
 
 satisfying the following expression (1) and expression (2):
   10 mass %≤15C+Mn+0.5Cr+Ni≤20 mass %  (1), and
 
   Cr eq /Ni eq <5.6  (2)
 
 
 where
   Cr eq =Cr+Mo+1.5Si+0.5Nb, and 
   Ni eq =Ni+30C+30N+0.5Mn, and 
 
 where the characters C, Mn, Cr, Ni, Mo, Si, Nb, and N in the expression (1) and in the definition expressions of Cr eq  and Ni eq  represent a respective content of each corresponding element in the metal powder in terms of mass %. 
 
     
     
       2. The metal powder according to  claim 1 , further comprising:
 0.1 mass %≤Nb≤1.0 mass %. 
 
     
     
       3. The metal powder according to  claim 1 , further comprising:
 0.1 mass %≤W≤1.5 mass %. 
 
     
     
       4. The metal powder according to  claim 1 , further comprising at least one of:
 P≤0.03 mass %, and 
 S≤0.03 mass %. 
 
     
     
       5. The metal powder according to  claim 2 , further comprising at least one of:
 P≤0.03 mass %, and 
 S≤0.03 mass %. 
 
     
     
       6. The metal powder according to  claim 3 , further comprising at least one of:
 P≤0.03 mass %, and 
 S≤0.03 mass %. 
 
     
     
       7. The metal powder according to  claim 1 , further satisfying the following expression (2′):
   Cr eq /Ni eq <2.5  (2′).
 
 
     
     
       8. The metal powder according to  claim 3 , further satisfying the following expression (2′):
   Cr eq /Ni eq <2.5  (2′).
 
 
     
     
       9. The metal powder according to  claim 5 , further satisfying the following expression (2′):
   Cr eq /Ni eq <2.5  (2′).
 
 
     
     
       10. The metal powder according to  claim 6 , further satisfying the following expression (2′):
   Cr eq /Ni eq <2.5  (2′).
 
 
     
     
       11. The metal powder according to  claim 1 , which is used for additive manufacturing. 
     
     
       12. The metal powder according to  claim 3 , which is used for additive manufacturing. 
     
     
       13. The metal powder according to  claim 6 , which is used for additive manufacturing. 
     
     
       14. The metal powder according to  claim 7 , which is used for additive manufacturing. 
     
     
       15. The metal powder according to  claim 8 , which is used for additive manufacturing. 
     
     
       16. The metal powder according to  claim 9 , which is used for additive manufacturing. 
     
     
       17. The metal powder according to  claim 10 , which is used for additive manufacturing.